diff options
Diffstat (limited to 'arch/sh/boards/dreamcast')
| -rw-r--r-- | arch/sh/boards/dreamcast/Makefile | 6 | ||||
| -rw-r--r-- | arch/sh/boards/dreamcast/irq.c | 153 | ||||
| -rw-r--r-- | arch/sh/boards/dreamcast/rtc.c | 81 | ||||
| -rw-r--r-- | arch/sh/boards/dreamcast/setup.c | 64 |
4 files changed, 0 insertions, 304 deletions
diff --git a/arch/sh/boards/dreamcast/Makefile b/arch/sh/boards/dreamcast/Makefile deleted file mode 100644 index 7b97546c7e5..00000000000 --- a/arch/sh/boards/dreamcast/Makefile +++ /dev/null @@ -1,6 +0,0 @@ -# -# Makefile for the Sega Dreamcast specific parts of the kernel -# - -obj-y := setup.o irq.o rtc.o - diff --git a/arch/sh/boards/dreamcast/irq.c b/arch/sh/boards/dreamcast/irq.c deleted file mode 100644 index 9d0673a9092..00000000000 --- a/arch/sh/boards/dreamcast/irq.c +++ /dev/null @@ -1,153 +0,0 @@ -/* - * arch/sh/boards/dreamcast/irq.c - * - * Holly IRQ support for the Sega Dreamcast. - * - * Copyright (c) 2001, 2002 M. R. Brown <mrbrown@0xd6.org> - * - * This file is part of the LinuxDC project (www.linuxdc.org) - * Released under the terms of the GNU GPL v2.0 - */ - -#include <linux/irq.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/dreamcast/sysasic.h> - -/* Dreamcast System ASIC Hardware Events - - - The Dreamcast's System ASIC (a.k.a. Holly) is responsible for receiving - hardware events from system peripherals and triggering an SH7750 IRQ. - Hardware events can trigger IRQs 13, 11, or 9 depending on which bits are - set in the Event Mask Registers (EMRs). When a hardware event is - triggered, it's corresponding bit in the Event Status Registers (ESRs) - is set, and that bit should be rewritten to the ESR to acknowledge that - event. - - There are three 32-bit ESRs located at 0xa05f8900 - 0xa05f6908. Event - types can be found in include/asm-sh/dreamcast/sysasic.h. There are three - groups of EMRs that parallel the ESRs. Each EMR group corresponds to an - IRQ, so 0xa05f6910 - 0xa05f6918 triggers IRQ 13, 0xa05f6920 - 0xa05f6928 - triggers IRQ 11, and 0xa05f6930 - 0xa05f6938 triggers IRQ 9. - - In the kernel, these events are mapped to virtual IRQs so that drivers can - respond to them as they would a normal interrupt. In order to keep this - mapping simple, the events are mapped as: - - 6900/6910 - Events 0-31, IRQ 13 - 6904/6924 - Events 32-63, IRQ 11 - 6908/6938 - Events 64-95, IRQ 9 - -*/ - -#define ESR_BASE 0x005f6900 /* Base event status register */ -#define EMR_BASE 0x005f6910 /* Base event mask register */ - -/* Helps us determine the EMR group that this event belongs to: 0 = 0x6910, - 1 = 0x6920, 2 = 0x6930; also determine the event offset */ -#define LEVEL(event) (((event) - HW_EVENT_IRQ_BASE) / 32) - -/* Return the hardware event's bit positon within the EMR/ESR */ -#define EVENT_BIT(event) (((event) - HW_EVENT_IRQ_BASE) & 31) - -/* For each of these *_irq routines, the IRQ passed in is the virtual IRQ - (logically mapped to the corresponding bit for the hardware event). */ - -/* Disable the hardware event by masking its bit in its EMR */ -static inline void disable_systemasic_irq(unsigned int irq) -{ - __u32 emr = EMR_BASE + (LEVEL(irq) << 4) + (LEVEL(irq) << 2); - __u32 mask; - - mask = inl(emr); - mask &= ~(1 << EVENT_BIT(irq)); - outl(mask, emr); -} - -/* Enable the hardware event by setting its bit in its EMR */ -static inline void enable_systemasic_irq(unsigned int irq) -{ - __u32 emr = EMR_BASE + (LEVEL(irq) << 4) + (LEVEL(irq) << 2); - __u32 mask; - - mask = inl(emr); - mask |= (1 << EVENT_BIT(irq)); - outl(mask, emr); -} - -/* Acknowledge a hardware event by writing its bit back to its ESR */ -static void ack_systemasic_irq(unsigned int irq) -{ - __u32 esr = ESR_BASE + (LEVEL(irq) << 2); - disable_systemasic_irq(irq); - outl((1 << EVENT_BIT(irq)), esr); -} - -/* After a IRQ has been ack'd and responded to, it needs to be renabled */ -static void end_systemasic_irq(unsigned int irq) -{ - if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) - enable_systemasic_irq(irq); -} - -static unsigned int startup_systemasic_irq(unsigned int irq) -{ - enable_systemasic_irq(irq); - - return 0; -} - -static void shutdown_systemasic_irq(unsigned int irq) -{ - disable_systemasic_irq(irq); -} - -struct hw_interrupt_type systemasic_int = { - .typename = "System ASIC", - .startup = startup_systemasic_irq, - .shutdown = shutdown_systemasic_irq, - .enable = enable_systemasic_irq, - .disable = disable_systemasic_irq, - .ack = ack_systemasic_irq, - .end = end_systemasic_irq, -}; - -/* - * Map the hardware event indicated by the processor IRQ to a virtual IRQ. - */ -int systemasic_irq_demux(int irq) -{ - __u32 emr, esr, status, level; - __u32 j, bit; - - switch (irq) { - case 13: - level = 0; - break; - case 11: - level = 1; - break; - case 9: - level = 2; - break; - default: - return irq; - } - emr = EMR_BASE + (level << 4) + (level << 2); - esr = ESR_BASE + (level << 2); - - /* Mask the ESR to filter any spurious, unwanted interrupts */ - status = inl(esr); - status &= inl(emr); - - /* Now scan and find the first set bit as the event to map */ - for (bit = 1, j = 0; j < 32; bit <<= 1, j++) { - if (status & bit) { - irq = HW_EVENT_IRQ_BASE + j + (level << 5); - return irq; - } - } - - /* Not reached */ - return irq; -} diff --git a/arch/sh/boards/dreamcast/rtc.c b/arch/sh/boards/dreamcast/rtc.c deleted file mode 100644 index b3a876a3b85..00000000000 --- a/arch/sh/boards/dreamcast/rtc.c +++ /dev/null @@ -1,81 +0,0 @@ -/* - * arch/sh/boards/dreamcast/rtc.c - * - * Dreamcast AICA RTC routines. - * - * Copyright (c) 2001, 2002 M. R. Brown <mrbrown@0xd6.org> - * Copyright (c) 2002 Paul Mundt <lethal@chaoticdreams.org> - * - * Released under the terms of the GNU GPL v2.0. - * - */ - -#include <linux/time.h> -#include <asm/rtc.h> -#include <asm/io.h> - -/* The AICA RTC has an Epoch of 1/1/1950, so we must subtract 20 years (in - seconds) to get the standard Unix Epoch when getting the time, and add - 20 years when setting the time. */ -#define TWENTY_YEARS ((20 * 365LU + 5) * 86400) - -/* The AICA RTC is represented by a 32-bit seconds counter stored in 2 16-bit - registers.*/ -#define AICA_RTC_SECS_H 0xa0710000 -#define AICA_RTC_SECS_L 0xa0710004 - -/** - * aica_rtc_gettimeofday - Get the time from the AICA RTC - * @ts: pointer to resulting timespec - * - * Grabs the current RTC seconds counter and adjusts it to the Unix Epoch. - */ -void aica_rtc_gettimeofday(struct timespec *ts) -{ - unsigned long val1, val2; - - do { - val1 = ((ctrl_inl(AICA_RTC_SECS_H) & 0xffff) << 16) | - (ctrl_inl(AICA_RTC_SECS_L) & 0xffff); - - val2 = ((ctrl_inl(AICA_RTC_SECS_H) & 0xffff) << 16) | - (ctrl_inl(AICA_RTC_SECS_L) & 0xffff); - } while (val1 != val2); - - ts->tv_sec = val1 - TWENTY_YEARS; - - /* Can't get nanoseconds with just a seconds counter. */ - ts->tv_nsec = 0; -} - -/** - * aica_rtc_settimeofday - Set the AICA RTC to the current time - * @secs: contains the time_t to set - * - * Adjusts the given @tv to the AICA Epoch and sets the RTC seconds counter. - */ -int aica_rtc_settimeofday(const time_t secs) -{ - unsigned long val1, val2; - unsigned long adj = secs + TWENTY_YEARS; - - do { - ctrl_outl((adj & 0xffff0000) >> 16, AICA_RTC_SECS_H); - ctrl_outl((adj & 0xffff), AICA_RTC_SECS_L); - - val1 = ((ctrl_inl(AICA_RTC_SECS_H) & 0xffff) << 16) | - (ctrl_inl(AICA_RTC_SECS_L) & 0xffff); - - val2 = ((ctrl_inl(AICA_RTC_SECS_H) & 0xffff) << 16) | - (ctrl_inl(AICA_RTC_SECS_L) & 0xffff); - } while (val1 != val2); - - return 0; -} - -void aica_time_init(void) -{ - rtc_sh_get_time = aica_rtc_gettimeofday; - rtc_sh_set_time = aica_rtc_settimeofday; -} - diff --git a/arch/sh/boards/dreamcast/setup.c b/arch/sh/boards/dreamcast/setup.c deleted file mode 100644 index 2581c8cd5df..00000000000 --- a/arch/sh/boards/dreamcast/setup.c +++ /dev/null @@ -1,64 +0,0 @@ -/* - * arch/sh/boards/dreamcast/setup.c - * - * Hardware support for the Sega Dreamcast. - * - * Copyright (c) 2001, 2002 M. R. Brown <mrbrown@linuxdc.org> - * Copyright (c) 2002, 2003, 2004 Paul Mundt <lethal@linux-sh.org> - * - * This file is part of the LinuxDC project (www.linuxdc.org) - * - * Released under the terms of the GNU GPL v2.0. - * - * This file originally bore the message (with enclosed-$): - * Id: setup_dc.c,v 1.5 2001/05/24 05:09:16 mrbrown Exp - * SEGA Dreamcast support - */ - -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/param.h> -#include <linux/interrupt.h> -#include <linux/init.h> -#include <linux/irq.h> -#include <linux/device.h> -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/rtc.h> -#include <asm/machvec.h> -#include <asm/mach/sysasic.h> - -extern struct hw_interrupt_type systemasic_int; -extern void aica_time_init(void); -extern int gapspci_init(void); -extern int systemasic_irq_demux(int); - -static void __init dreamcast_setup(char **cmdline_p) -{ - int i; - - /* Mask all hardware events */ - /* XXX */ - - /* Acknowledge any previous events */ - /* XXX */ - - __set_io_port_base(0xa0000000); - - /* Assign all virtual IRQs to the System ASIC int. handler */ - for (i = HW_EVENT_IRQ_BASE; i < HW_EVENT_IRQ_MAX; i++) - irq_desc[i].chip = &systemasic_int; - - board_time_init = aica_time_init; - -#ifdef CONFIG_PCI - if (gapspci_init() < 0) - printk(KERN_WARNING "GAPSPCI was not detected.\n"); -#endif -} - -static struct sh_machine_vector mv_dreamcast __initmv = { - .mv_name = "Sega Dreamcast", - .mv_setup = dreamcast_setup, - .mv_irq_demux = systemasic_irq_demux, -}; |